Development of microstructure in high-alloy steel K390 using semi-solid forming

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F16%3A43928627" target="_blank" >RIV/49777513:23210/16:43928627 - isvavai.cz</a>

Výsledek na webu

<a href="http://iopscience.iop.org/article/10.1088/1757-899X/118/1/012022/pdf" target="_blank" >http://iopscience.iop.org/article/10.1088/1757-899X/118/1/012022/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1757-899X/118/1/012022" target="_blank" >10.1088/1757-899X/118/1/012022</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Development of microstructure in high-alloy steel K390 using semi-solid forming

Popis výsledku v původním jazyce

Semi-solid processing of light alloys, namely aluminium and magnesium alloys, is a widely known and well-established process. By contrast, processing of powder steels which have high levels of alloying elements is a rather new subject of research. Thixoforming of high-alloy steels entails a number of technical difficulties. If these are overcome, the method can offer a variety of benefits. First of all, the final products shape and the desired mechanical properties can be obtained using a single forming operation. Semi-solid forming can produce unusual powder steel microstrucures unattainable by any other route. Generally, the microstructures, which are normally found in thixoformed steels, consists of large fractions of globular or polygonal particles of metastable austenite embedded in a carbide network. An example is the X210Cr12 steel which is often used for semi-solid processing experiments. A disadvantage of the normal microstructure configuration is the brittleness of the carbide network, in which cracks initiate and propagate, causing low energy fractures. However, there is a newly-developed mini-thixoforming route which produces microstructures with an inverted configuration. Here, the material chosen for this purpose was K390 steel, in which the content of alloying elements is up to 24%. Its microstructure which was obtained by mini-thixoforming did not contain polyhedral austenite grains but hard carbides embedded in a ductile austenitic matrix. This provided the material with improved toughness. The spaces between the austenite grains were filled with a eutectic in which chromium, molybdenum and complex-shaped demonstration products were manufactured by this route. These products showed and extraordinary compressive strenght and high wear resistance, thanks to the hardness of their microstructure constituents, predominantly the carbides.

Název v anglickém jazyce

Development of microstructure in high-alloy steel K390 using semi-solid forming

Popis výsledku anglicky

Semi-solid processing of light alloys, namely aluminium and magnesium alloys, is a widely known and well-established process. By contrast, processing of powder steels which have high levels of alloying elements is a rather new subject of research. Thixoforming of high-alloy steels entails a number of technical difficulties. If these are overcome, the method can offer a variety of benefits. First of all, the final products shape and the desired mechanical properties can be obtained using a single forming operation. Semi-solid forming can produce unusual powder steel microstrucures unattainable by any other route. Generally, the microstructures, which are normally found in thixoformed steels, consists of large fractions of globular or polygonal particles of metastable austenite embedded in a carbide network. An example is the X210Cr12 steel which is often used for semi-solid processing experiments. A disadvantage of the normal microstructure configuration is the brittleness of the carbide network, in which cracks initiate and propagate, causing low energy fractures. However, there is a newly-developed mini-thixoforming route which produces microstructures with an inverted configuration. Here, the material chosen for this purpose was K390 steel, in which the content of alloying elements is up to 24%. Its microstructure which was obtained by mini-thixoforming did not contain polyhedral austenite grains but hard carbides embedded in a ductile austenitic matrix. This provided the material with improved toughness. The spaces between the austenite grains were filled with a eutectic in which chromium, molybdenum and complex-shaped demonstration products were manufactured by this route. These products showed and extraordinary compressive strenght and high wear resistance, thanks to the hardness of their microstructure constituents, predominantly the carbides.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

—

Projekt

<a href="/cs/project/LO1502" target="_blank" >LO1502: Rozvoj Regionálního technologického institutu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

IOP Conference Series: Materials Science and Engineering

ISBN

978-3-00-052212-3

ISSN

1757-8981

e-ISSN

—

Počet stran výsledku

7

Strana od-do

1-7

Název nakladatele

IOP Publishing Ltd

Místo vydání

Bristol

Místo konání akce

Chemnitz

Datum konání akce

10. 3. 2016

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

000376260700062